# Oura Ring 4 vs Circular Ring 2: specs and price compared

A sourced, side-by-side comparison of the Oura Ring 4 (Oura) and Circular Ring 2 (Circular) among smart rings. Oura Ring 4 is the cheaper of the two at $349.

## Side by side

| Spec | Oura Ring 4 | Circular Ring 2 |
| --- | --- | --- |
| US price | $349 | $379 |
| Brand | Oura | Circular |
| Released | 2024-10 | 2025-08 |
| Material | Titanium (non-allergenic inner and outer surfaces) | Titanium (PVD coating on premium finishes) |
| Weight (g) | 3.3-5.2 | 3 |
| Battery days | 8 | 8 |
| Spo2 | Yes | Yes |
| Temperature sensor | Yes | Yes |
| Ecg | No | Yes |
| Subscription required | Yes | No |
| Water resistance (m) | 100 | — |

## Key differences

- Material: Oura Ring 4 Titanium (non-allergenic inner and outer surfaces) vs Circular Ring 2 Titanium (PVD coating on premium finishes)
- Weight (g): Oura Ring 4 3.3-5.2 vs Circular Ring 2 3
- Ecg: Oura Ring 4 No vs Circular Ring 2 Yes
- Subscription required: Oura Ring 4 Yes vs Circular Ring 2 No

## What reviewers say

**Oura Ring 4** — Four testers (Tom's Guide, TechRadar, Engadget, Digital Trends) all hands-on-tested the Oura Ring 4 and call it the best smart ring you can buy, praising the all-titanium comfort and companion app. Every source flags the mandatory ~$5.99/month subscription; easy scratching and step/calorie/activity-detection accuracy are the recurring doubts across reviews. (4 sourced reviews.)

## Sources

- Oura Ring 4: https://ouraring.com/store/rings/oura-ring-4 (ouraring.com, verified 2026-06-15)
- Circular Ring 2: https://shop.circular.xyz/products/circular-ring-2 (shop.circular.xyz, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/smart-rings/oura-ring-4-vs-circular-ring-2/
Cite: Per The Front Desk Review, Oura Ring 4 ($349) vs Circular Ring 2 ($379) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/smart-rings/oura-ring-4-vs-circular-ring-2/
License: CC BY 4.0.